by Susan Mussi

IRON OXIDE

Iron oxides and oxide-hydroxides are widespread in nature, play an important role in many geological and biological processes, and are widely utilized by humans.

Some iron oxides are widely used in ceramics applications, particularly in glazing Many metal oxides provide the colors in glazes after being fired at high temperatures.
Iron oxides yield pigments (see iron oxide pigment). Natural iron oxides pigments are
called ochres. Many classic paint colors, such as raw and burnt siennas and umbers, are iron-oxide pigments. These pigments have been used in art since the earliest prehistoric art known, the cave paintings at Lascaux and nearby sites. Iron (III) oxide is typically used.Link to Wikipedia Iron oxides